Resins from 1, 2, 5, 6-diepoxycyclooctane



United States Patent Ofifice 3,005,205 Patented Nov. 20, 1962 3,065,209 RESlNS FROM l,2,5,6-DIEPOXYCYCLOQCTANE Frederick C. F rustic-1r, 51"., and Benjamin Phillips, both of Charleston, W. Va, assignors to Union Carbide Corporation, a corporation of New York No Drawing. Filed (Bet. 12, 1061, Ser. No. 144,575 2 Claims. (Cl. Mil-48.4)

This invention relates to 1,2,5,6-diepoxycylooctane, and to compositions and resinous products obtained therefrom. The diepoxide of this invention is of particular interest in the plastics and resins industry and is particularly adapted for use in the preparation of resinous products by reaction with difunctional organic chemical compounds such as diamines, dialdehydes, dicarboxylic acids, diols and the like. The resinous products thus produced can then be formed into useful articles or employed in electrical applications as potting compositions. Furthermore, the diepoxides of this invention will react with adipic acid to form flexible, thermoplastic resins. Consequently, this diepoxide, in admixture with adipic acid, provides compositions which are particularly desirable for use in coating applications wherein flexible, thermoplastic surface coatings are desired. In addition, l,2,5,6,-diepoxycylooctane is also useful as a stabilizer for vinyl chloride resins.

The 1,2,5,6-diepoxycyclooctane of this invention can be represented graphically by the following general formula:

The preparation of the diepoxide is carried out by reacting l,5-cyclooctadiene and at least 2 moles of peracetic acid, per mole of 1,5-cyclooctadiene. The reaction of LS-cyclooctadiene and peracetic acid is preferably carried out by the addition of an excess amount of peracetic acid to the 1,5-cyclooctadiene at temperatures in the range of from 25 C. to about 150 C. and preferably in the range of from C. to 45 C. The reaction is exothermic and external cooling can be applied, if desired, to maintain the desired temperature and to assure a reasonable reaction rate. The reaction is allowed to proceed until an analysis of a sample of the reaction mixture indicates that the theoretical amount of peracetic acid has been consumed. The product is recovered from the reaction mixture by separation of the unreacted peracetic acid under any suitable conditions which will not destroy the epoxide groups. Preferred methods for recovering 1,2,5,6-diepoxycyclooctane from the reaction mixture include extraction, continuous distillation and distillation under reduced pressures.

In formulating compositions of 1,2,5,6-diep-oxycyclooctane with adipic acid suflicient acid is admixed with the 1,2,5,6diepoxycycl0octane so as to provide a composition containing from about 0.5 to about 1.2 carboxyl groups per epoxy group. Heating the compositions, so formulated, at elevated temperatures, generally on the order of about 120 C. to about 160 C. for a period of time of about 5 to about hours will result in the production of a resinous product which is flexible and thermoplastic. The exact heating cycle will depend, of course, on the particular composition being heated. The following examples illustrate the present invention and are not intended to limit the scope thereof in any manner.

EXAMPLE 1 Preparation of 1,2,5,6-Diepoxycycl00ctane 1,5,-cyclooctadiene grams, 0.231 mole) was placed in a flask fitted with a stirrer and external cooling, and 188 grams of a 23.4% solution of peracetic acid in ethyl acetate (44 grams, 0.578 mole of peracetic acid) was added dropwise over a period of twenty-five minutes. During the addition and for two hours thereafter, the reaction solution was maintained at a temperature of 35 C. At the end of this period, an analysis for peracetic acid indicated that 97.8% of the theoretical amount of peracetic acid has been consumed.

The reaction solution was then added dropwise to a still kettle containing ethylbenzene refluxing at 25 mm. pressure. During the addition, there was distilled at the head enough material so that a head temperature of 30 C. to 32 C. was maintained. After addition, a lowboiling material was distilled up to the boiling point of pure ethylbenzene. There remained 72 grams of residue product which analyzed 0.14% as acetic acid. The residue product was fractionated through a ten-inch column packed with glass helixes, and there was obtained 27 grams of l,2,5,G-diepoxycyclooctane which represented an 84.0% yield. The product, 1,2,5,6-diepoxycyclooctane was characterized and had the following physical properties:

Boiling Point=12 C.-93 C. (4 mm. Hg)

Refractive index, n =L4935 Analysis Calculated for C H O Theoretical Found 0 percent 68. 54 68. 40 E percent 8. 63 8. 77

EXAMPLE 2 Control 1 Composition A 1,2,4,5-diopoxyc clohcxane grams 0. 6 1,2,5,(l-dienoxycyclocctane, do 0.7 adipic acid do. 0.37 0.37 carbox vl group per epoxy group 0.6 to l 0.6 to 1 Each composition was subjected to the following heating cycle: seven hours at a temperature of C., and then six hours at a temperature of C.

At the end of the heating cycle, the product obtained from Control 1 was yellow in color and was a tough, intusible thermoset resin which had a Barcol hardness of 57, determined using a Barcol l'mpressor GYZI 934-1.

At the end of the same heating cycle, the product obtained from Composition A was a soft, flexible, thermo plastic resin which melted, when heated to a temperature of 160 C.

This application is a continuation in part of our copending application, Serial No. 527,424, filed August 9, 1955 and entitled 1,2,5,6-Diepoxycyclooctane and Process for the Preparation Thereof.

What is claimed is:

l. A composition comprising 1,2,5,6-di poxycyclooctane and adipic acid, said adipic acid being present in said composition in an amount to provide from about 0.5 to about 1.2 carboxyl grou as per epoxy group.

2. The thermoplastic resin obtained from the composition defined in claim 1.

Reieaenees (Iii-e0 in he fiie of this patent UNITED ST TES PATENTS 2,571,208 Craig Oct. 16, 1951 2,739,161 Carlson Mar. 20, 1956 2,745,847 Phillips et a1. May 15, 1956 2,750,395 Philiips et a1 Zune 12, 1956 2,786,067 Frostick et a1 Mar. 19, 1957 2,801,232 Suen et a1 July 30, 1957 2,890,197 Phillips et a1. June 9, 1959 FOREIGN PATENTS 520,163 Great Britain Apr. 16, 1940 549,916 Belguim Aug. 14, 1956 OTH FERENCES Godchot: Comm-es Rendus, v. 192, pp. 962-964 (1931). Bedos: Compies Rendus, y. 195, ,1). 802-804 (1932). Richter: Textbook of Grganic Chcmisiry (1952), pp. 20-21 (Wiley).

Organic Reactions, v01. VII, pp. 402-404 (1953), Wiley.

Webstefs New International (1939), pp. 1194.

Richter: Chemistry of the Carbon Compounds (Aiie) vs]. 2,page 1 (3rd Ed.,1939).

the Carbo Dieiionary, 2nd Ed.

Richter: Chemistry of Compounds, v01. 4,

I pp. 4-5 (1947). 

1. A COMPOSITION COMPRISING 1,2,5,6-DIEPOXYCYLOOCTANE AND ADIPIC ACID, SAID ADIPIC ACID BEING PRESENT IN SAID COMPOSITION IN AN AMOUNT OF PROVIDE FROM ABOUT 0.5 TO ABOUT 1.2 CARBOXYL GROUPS PER EPOXY GROUP. 